final ArgumentCallback<LatLng> onTap
例：
GoogleMap(
markers: _markers,
initialCameraPosition: _theSecretLocation,
onMapCreated: (GoogleMapController controller) {
_controller.complete(controller);
},
onTap: _handleTap,
),
...
_handleTap(LatLng point) {
setState(() {
_markers.add(Marker(
markerId: MarkerId(point.toString()),
position: point,
infoWindow: InfoWindow(
title: 'I am a marker',
),
icon:
BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueMagenta),
));
});
}
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